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HTML 

              
                    <div class="form-body">
        <div class="row">
            <div class="form-holder">
                <div class="form-content">
                    <div class="form-items">
                        <h3>Register Today</h3>
                        <p>Fill in the data below.</p>
                        <form class="requires-validation" novalidate>

                            <div class="col-md-12">
                               <input class="form-control" type="text" name="name" placeholder="Full Name" required>
                               <div class="valid-feedback">Username field is valid!</div>
                               <div class="invalid-feedback">Username field cannot be blank!</div>
                            </div>

                            <div class="col-md-12">
                                <input class="form-control" type="email" name="email" placeholder="E-mail Address" required>
                                 <div class="valid-feedback">Email field is valid!</div>
                                 <div class="invalid-feedback">Email field cannot be blank!</div>
                            </div>

                           <div class="col-md-12">
                                <select class="form-select mt-3" required>
                                      <option selected disabled value="">Position</option>
                                      <option value="jweb">Junior Web Developer</option>
                                      <option value="sweb">Senior Web Developer</option>
                                      <option value="pmanager">Project Manager</option>
                               </select>
                                <div class="valid-feedback">You selected a position!</div>
                                <div class="invalid-feedback">Please select a position!</div>
                           </div>


                           <div class="col-md-12">
                              <input class="form-control" type="password" name="password" placeholder="Password" required>
                               <div class="valid-feedback">Password field is valid!</div>
                               <div class="invalid-feedback">Password field cannot be blank!</div>
                           </div>


                           <div class="col-md-12 mt-3">
                            <label class="mb-3 mr-1" for="gender">Gender: </label>

                            <input type="radio" class="btn-check" name="gender" id="male" autocomplete="off" required>
                            <label class="btn btn-sm btn-outline-secondary" for="male">Male</label>

                            <input type="radio" class="btn-check" name="gender" id="female" autocomplete="off" required>
                            <label class="btn btn-sm btn-outline-secondary" for="female">Female</label>

                            <input type="radio" class="btn-check" name="gender" id="secret" autocomplete="off" required>
                            <label class="btn btn-sm btn-outline-secondary" for="secret">Secret</label>
                               <div class="valid-feedback mv-up">You selected a gender!</div>
                                <div class="invalid-feedback mv-up">Please select a gender!</div>
                            </div>

                        <div class="form-check">
                          <input class="form-check-input" type="checkbox" value="" id="invalidCheck" required>
                          <label class="form-check-label">I confirm that all data are correct</label>
                         <div class="invalid-feedback">Please confirm that the entered data are all correct!</div>
                        </div>
                  

                            <div class="form-button mt-3">
                                <button id="submit" type="submit" class="btn btn-primary">Register</button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;700;900&display=swap');

*, body {
    font-family: 'Poppins', sans-serif;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    -moz-osx-font-smoothing: grayscale;
}

html, body {
    height: 100%;
    background-color: #152733;
    overflow: hidden;
}


.form-holder {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      min-height: 100vh;
}

.form-holder .form-content {
    position: relative;
    text-align: center;
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-align-items: center;
    align-items: center;
    padding: 60px;
}

.form-content .form-items {
    border: 3px solid #fff;
    padding: 40px;
    display: inline-block;
    width: 100%;
    min-width: 540px;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    border-radius: 10px;
    text-align: left;
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
}

.form-content h3 {
    color: #fff;
    text-align: left;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 5px;
}

.form-content h3.form-title {
    margin-bottom: 30px;
}

.form-content p {
    color: #fff;
    text-align: left;
    font-size: 17px;
    font-weight: 300;
    line-height: 20px;
    margin-bottom: 30px;
}


.form-content label, .was-validated .form-check-input:invalid~.form-check-label, .was-validated .form-check-input:valid~.form-check-label{
    color: #fff;
}

.form-content input[type=text], .form-content input[type=password], .form-content input[type=email], .form-content select {
    width: 100%;
    padding: 9px 20px;
    text-align: left;
    border: 0;
    outline: 0;
    border-radius: 6px;
    background-color: #fff;
    font-size: 15px;
    font-weight: 300;
    color: #8D8D8D;
    -webkit-transition: all 0.3s ease;
    transition: all 0.3s ease;
    margin-top: 16px;
}


.btn-primary{
    background-color: #6C757D;
    outline: none;
    border: 0px;
     box-shadow: none;
}

.btn-primary:hover, .btn-primary:focus, .btn-primary:active{
    background-color: #495056;
    outline: none !important;
    border: none !important;
     box-shadow: none;
}

.form-content textarea {
    position: static !important;
    width: 100%;
    padding: 8px 20px;
    border-radius: 6px;
    text-align: left;
    background-color: #fff;
    border: 0;
    font-size: 15px;
    font-weight: 300;
    color: #8D8D8D;
    outline: none;
    resize: none;
    height: 120px;
    -webkit-transition: none;
    transition: none;
    margin-bottom: 14px;
}

.form-content textarea:hover, .form-content textarea:focus {
    border: 0;
    background-color: #ebeff8;
    color: #8D8D8D;
}

.mv-up{
    margin-top: -9px !important;
    margin-bottom: 8px !important;
}

.invalid-feedback{
    color: #ff606e;
}

.valid-feedback{
   color: #2acc80;
}
!

JS 

              
                (function () {
'use strict'
const forms = document.querySelectorAll('.requires-validation')
Array.from(forms)
  .forEach(function (form) {
    form.addEventListener('submit', function (event) {
      if (!form.checkValidity()) {
        event.preventDefault()
        event.stopPropagation()
      }

      form.classList.add('was-validated')
    }, false)
  })
})()
!
999px

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